如果您熟悉高速缓存，从本质上来说会话与它是相同的概念—存储数据以减少响应时间和服务器工作负载。

If you're familiar with caching, it is essentially the same concept — storing data to reduce both response time and server workload.

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这样做的缺点是数据存储要求很多时间和工作量建立正确的索引。

The drawback to this is that the data storage requires that you spend a lot of time and effort doing proper indexing.

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对于大型的测试数据存储，这将耗费大量的时间。

For a large test data store, this can take a number of hours.

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